Alert archive / Alabama / Flash Flood Warnings in 2026

Flash Flood Warning 30, NWS Huntsville, AL

August 20, 20266 counties in Alabama

NWS Huntsville, AL issued this flash flood warning at Aug 20, 2026, 11:56 PM CDT for 6 counties in Alabama. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 20, 2026, 11:56 PM CDT (04:56 UTC)
Expired
Aug 21, 2026, 2:49 AM CDT
In force
3 hr
Issued by
NWS Huntsville, AL
Area
Storm-based polygon
Flood severity
None

Counties Cullman County, AL, DeKalb County, AL, Jackson County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL

The radar

The Northeast Alabama radar (KHTX), 56 km from the middle of the area, began a volume at 04:56 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 4.9 hours before the alert went out and 150 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Birmingham, AL at 00:00Z on 2026-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3903 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 00:00Z on 2026-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
3903 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
1483 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
35 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Huntsville, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 20, 7:33 PM CDTSevere Thunderstorm WarningHUNColbert, Lauderdale42 min
Aug 20, 8:14 PM CDTSpecial Weather StatementHUNLauderdale31 min
Aug 20, 8:23 PM CDTSevere Thunderstorm WarningHUNLauderdale, Limestone52 min
Aug 20, 8:33 PM CDTSpecial Weather StatementHUNLimestone42 min
Aug 20, 8:41 PM CDTSevere Thunderstorm WarningHUNJackson, Madison64 min
Aug 20, 8:43 PM CDTSpecial Weather StatementHUNLauderdale47 min
Aug 20, 8:52 PM CDTSpecial Weather StatementHUNMarshall38 min
Aug 20, 9:10 PM CDTSevere Thunderstorm WarningHUNColbert, Lauderdale, Lawrence, Limestone, Madison, Morgan65 min
Aug 20, 9:21 PM CDTSpecial Weather StatementHUNMadison39 min
Aug 20, 9:52 PM CDTSpecial Weather StatementHUNJackson53 min
Aug 20, 9:58 PM CDTSevere Thunderstorm WarningHUNJackson, Madison, Marshall47 min
Aug 20, 10:04 PM CDTSevere Thunderstorm WarningHUNJackson41 min
Aug 20, 10:11 PM CDTSevere Thunderstorm WarningHUNLimestone, Madison, Morgan49 min
Aug 20, 10:25 PM CDTSpecial Weather StatementHUNLawrence50 min
Aug 20, 10:33 PM CDTFlash Flood WarningHUNJackson, Limestone, Madison, Morgan3 hr
Aug 20, 10:41 PM CDTSevere Thunderstorm WarningHUNJackson, Madison, Marshall, Morgan49 min
Aug 20, 10:48 PM CDTSpecial Weather StatementHUNMarshall42 min
Aug 20, 11:00 PM CDTSpecial Weather StatementHUNMorgan45 min
Aug 20, 11:06 PM CDTSpecial Weather StatementHUNCullman39 min
Aug 20, 11:26 PM CDTSevere Thunderstorm WarningHUNDeKalb, Marshall64 min
Aug 20, 11:27 PM CDTSevere Thunderstorm WarningHUNDeKalb, Jackson63 min
Aug 20, 11:36 PM CDTSpecial Weather StatementHUNMarshall54 min
Aug 21, 12:28 AM CDTSpecial Weather StatementHUNCullman, Marshall, Morgan47 min
Aug 21, 12:48 AM CDTFlash Flood WarningHUNCullman, Morgan2 hr
Aug 21, 1:29 AM CDTAreal Flood WarningHUNJackson, Lawrence, Limestone, Madison, Marshall, Morgan4 hr
Aug 21, 2:49 AM CDTAreal Flood WarningHUNCullman, DeKalb, Jackson, Madison, Marshall, Morgan2 hr
Aug 21, 2:52 AM CDTAreal Flood WarningHUNCullman, Lawrence, Morgan2 hr
Aug 20, 8:01 PM CDTSpecial Weather StatementHUNLincoln44 min
Aug 20, 8:17 PM CDTSpecial Weather StatementHUNFranklin43 min
Aug 20, 8:44 PM CDTSpecial Weather StatementHUNMoore46 min
Aug 20, 9:15 PM CDTSpecial Weather StatementHUNFranklin45 min
Aug 20, 10:18 PM CDTSpecial Weather StatementHUNLincoln42 min
Aug 20, 11:11 PM CDTSpecial Weather StatementHUNFranklin49 min

Nearby

Flash Flood Warnings in Alabama, 2026Every flash flood warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.